That one can be complex. My home server does mainly private stuff so external bandwidth/latency isn't a big issue. Even accounting for cycling drives out¹² and other involuntary maintenance³ the cost of putting the machine together and keeping it running is lower than I'd have spent on the monthly costs of a similarly specced machine with a good provider.

Power costs have made me reconsider that a bit in recent months, but hosting providers are putting up prices as they are subject to similar cost increases too so I'll wait a bit and see how that settles before making major changes.

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[1] I've had a few failures over the years, though thanks to RAID I've never actually lost data due to that⁴.

[2] Also for space upgrades, but that is an issue for externally hosted options too.

[3] The PSU went fzzzt early last year.

[4] Actual (temporary) data loss due to human error has occurred, but backups resolved those occurrences.