I have been making backups of my wallets. I have older backups. If, for some strange reason, I lose all my current backups and have to recover from an old backup, what happens?

Let's say I back up once a month and I have 10 transactions a month (in and out). In 6 months I'll have 6 backups. I will also have made 60 transactions since the first backup.

If I recover my wallet with the 6 month old back up, will everything update itself as it syncs to the blockchain?

The question is coming from the idea of placing a backup in a very secure location that is not quickly or easily accessed. Which in turn would mean it will not be the most current backup. If everything else is lost, I can retrieve that very old backup and continue on with bitcoin life .