Update concepts-backup.md

Pencil-edit in line 21 as reported in Acrolinx scorecard, "instantanious" to "instantaneous"

Author: PMEds28

articles/postgresql/concepts-backup.md

@@ -18,7 +18,7 @@ Azure Database for PostgreSQL takes backups of the data files and the transact
 
 ### Backup frequency
 
-Generally, full backups occur weekly, differential backups occur twice a day for servers with a max supported storage of 4 TB. Snapshot backups happen at least once a day for servers that support up to 16 TB of storage. Transaction log backups in both cases occur every five minutes. The first snapshot of full backup is scheduled immediately after a server is created. The initial full backup can take longer on a large restored server. The earliest point in time that a new server can be restored to is the time at which the initial full backup is complete. As snapshots are instantanious, servers with support up to 16 TB of storage can be restored all the way back to the create time.
+Generally, full backups occur weekly, differential backups occur twice a day for servers with a max supported storage of 4 TB. Snapshot backups happen at least once a day for servers that support up to 16 TB of storage. Transaction log backups in both cases occur every five minutes. The first snapshot of full backup is scheduled immediately after a server is created. The initial full backup can take longer on a large restored server. The earliest point in time that a new server can be restored to is the time at which the initial full backup is complete. As snapshots are instantaneous, servers with support up to 16 TB of storage can be restored all the way back to the create time.
 
 ### Backup redundancy options