What A Backup Of A Video Library Has To Survive

A backup is only meaningful against specific threats. Video libraries face several at once, and a scheme covering one may offer nothing against another.

Hardware failure is the expected case

Drives fail, sometimes without warning. A second copy on separate hardware addresses this and is the minimum any scheme should provide.

Redundant arrays survive individual drive failures while remaining online, which suits working storage where availability matters.

Redundancy is not a backup, because it protects only against drive failure. A deletion, a corruption or a fire affects every copy in the array simultaneously.

Deletion and overwriting need history

A file deleted by mistake propagates to any synchronized copy quickly. Both copies then agree, and both are wrong.

Protection requires versions retained over time so an earlier state can be recovered. Retention length determines how long a mistake can go unnoticed.

Video projects make this acute, since renders and exports are routinely overwritten and the original may be needed long after the change. Project files in particular are saved repeatedly and lose their earlier states.

Corruption spreads through automated copying

Silent corruption is copied faithfully by any synchronization process. The backup becomes an accurate copy of a damaged file.

Checksums recorded at creation allow verification before and after copying, so damage is detected rather than propagated.

Copies that are not connected continuously provide protection here, because damage cannot reach them automatically. A disconnected copy is unchanged by whatever happens to the working set.

Location loss requires distance

Fire, flood, theft and severe weather affect everything in one building. Copies in the same room fall together.

An off-site copy addresses this, whether hosted remotely or physically stored elsewhere. The distance matters more than the medium.

Video's size makes remote copying slow, so initial transfers are often made physically and incremental changes sent over the network afterward.

Restoration is the part that gets tested least

A backup nobody has restored from is an assumption. Failures in the restore path are common and only discovered when they matter most.

Restoring a sample and confirming the files open and play correctly is the only real test. It should be repeated periodically rather than once.

Time to restore matters too. Recovering a large library over a home connection can take a very long time, and knowing that in advance changes how the backup is designed.