IceDrive lost thousands of my files without any notification. Their support escalated my ticket, then ghosted me for 2 weeks before closing it. I’m sharing a script to check if your files are actually backed up: https://github.com/rupumped/NicksAPPS/blob/main/Python/IceDriveVerification.py. Note that it requires argparse.
Usage: python IceDriveVerification.py C:\Documents C:\Photos C:\Projects --backup-root I:\
I use Restic for online and Synology active backup for local.
For restic I either restore the backup if I have the space, or if not just mount it and compare, and restore a portion of it.
For active backup since they are bootable images I restore to a VM and test.