Mega.nz (now Mega.io), as many of you might know, is an online storage platform. I use it for backing up my files because it's encrypted and located in another territory. They include software called MegaSync that you can use to upload your files and folders to the service. I contacted Mega directly and asked them where their cached files were and here is their answer.
Quote<div class="ipsQuote_contents"> <p> <b style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;">The location of the folder .debris/SyncDebris</b><br style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;" /><span style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;">As advised in our previous email, they are placed inside every local synced folder.</span><br style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;" /><span style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;">Data accidentally deleted in your Cloud Drive Sync folder gets moved to a hidden folder named .rubbish (WIN) or .debris (Linux and macOS) on your computer<span> </span></span><b style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;">inside the local Sync folder<span> </span></b><span style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;">.</span><br style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;" /><span style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;">Example: Megasync on Mint - where there are two synchronization folders set.</span><br style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;" /><span style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;">/home/user/Documents/sync folder 1/.debris</span><br style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;" /><span style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;">/home/user/Pictures/sync folder 2/.debris</span><br style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;" /> </p> <p> [...] </p> <p> <span style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;">Further to our previous email. MEGAsync writes temp files for regular downloads in the target folders, and for sync downloads in the "Rubbish/tmp" (or .debris/tmp) folder inside the sync path.</span><br style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;" /><br style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;" /><span style="background-color:#ffffff;color:#1d2228;font-size:small;text-align:left;">So MEGAsync always writes temporary files in the target drive.</span> </p> <p> [...] </p> <p> <strong><span style="background-color:#ffffff;color:#333333;font-size:11px;text-align:left;">Our developers would not recommend deleting app and SDK caches.</span></strong><br style="background-color:#ffffff;color:#333333;font-size:11px;text-align:left;" /><span style="background-color:#ffffff;color:#333333;font-size:11px;text-align:left;">As they keep information that should not be wiped up often, such as sessions, transfer information for resumption, account state, config of the application, etc</span><br style="background-color:#ffffff;color:#333333;font-size:11px;text-align:left;" /><span style="background-color:#ffffff;color:#333333;font-size:11px;text-align:left;">In any case, if you would like to clear up leftovers data, they would suggest wiping up .debris/SyncDebris folders of syncs, placed inside every local synced folder.</span><br style="background-color:#ffffff;color:#333333;font-size:11px;text-align:left;" /></p> </div>
So, this is essentially where they store any leftover data on your computer as a cache. However, if the user decides to wipe the SDK directories, you may want to include a popup box warning that this should not be deleted and may reset the application settings. You can download the MegaSync software at https://mega.io/sync
If you guys are not interested in adding this app to the official CCleaner client, let me know, and I'll kick it over to the winapp2.ini team.
Thanks,
pogue