[paulddraper]

Don't your solutions give you potentially corrupted snapshots?

For this reason, for my backups, I run a cronjob on the EC2 instance and call fsfreeze (https://linux.die.net/man/8/fsfreeze). Is this unnecessary?

[zwily]

An EBS-snapshot should give a crash-consistent image. However, it's probably better to freeze if you can. If you're doing RAID across multiple volumes, you almost definitely need to freeze your volumes while all the snapshots start.