I have a Drobo 5 to protect iMac for six years. At the beginning stage, I inserted one 1T, two 2T and one 3T, it works fine these years. Every time once yellow warning lighted, I replaced a bigger capacity disk to replace the small ones, then it return to green and works smoothly. After six years, my Drobo 5 has one 3T, three 4T plus a 6T, much much bigger than before. This time, yellow warning lights again which indicates the 3T disk needs to be replaced by bigger disk. I suddenly thought that my iMac only has one 3T hard disk, why I use total 21T to protect a 3T disk? After check the back up history, the oldest back up was happened July 2015, a lot of back up in Drobo 5. I know that Time Machine could deletes the oldest back up when disk becomes full, so, why I need to buy more and more bigger capacity disks to replace it every time? This has become an endless game, as no matter how big the total capacity I increase, soon or later, it will be full if the oldest backup are still kept in it.
My queries are,
- May I leave the yellow warning and do nothing, and let Time Machine deletes the oldest back up automatically?
- Or, just simply delete the oldest back up until the Yellow or even Red back to Green?
Any suggestions is appreciated, thanks.