I thnk there are bugs when using Seadrive.
Seadrive client can cause mass delete files. It caused mostly when I remove the old seadrive client and install the new one.
The deleted files is randomly but I think it has relation with files that currently or just in sync.
Ourr system has been in situation of lost files many time. When reading in history, It alway have message like that: " Deleted “3a.CDR CDIO__KTD_20082020.doc” and 16 more files)
Roll back with the snapshot can recover the old ones. But (may be) lost the new update file after that time.
This error is very dangerous and it can repeat. Be careful.
Please check and resolve it.