Why is a cached service folder with a timestamp created after overwriting the original cached map service?

Note:
Because the original cached map service is generated as a backup, the available space on the drive where the cache is located can grow exponentially. This can lead to performance issues if there is insufficient space on the drive and especially if the ‘argiscache’ folder is located on the system drive (C:). Take this into consideration when selecting the appropriate option to update the cache.