Server disaster recovery

This is a bit broad - we have no idea about your environment from the question you asked.  And backups (which Arcserve is) is just one aspect of disaster recovery.

Personally, I perform backups of my VMs using Altaro and I also replicate the VMs off site and perform a backup there.  This ensures off site backups that are up to date and minimal data loss in a true disaster.  (I haven't used Arcserve in probably 18 years).

disaster recovery plan is depends up on your environment scenario as said by Mr Lee.

the second thing is is it physical environment or virtual ?

if physical then you have to backup complete server on premise or off premise (it's depends upon datasize and connection speed)

if data is huge then take bakup at onpremise and copy to off premise (DR Site) which should be seperate physycal location far from your present.  or it could be cloud.


if it's a VM then just copy the VM and save it at offsite location

in case of Disaster happens then plan to inidiate servers from that site... or bring back to present location .. depending upon scenario...

all the best

Implement redundancy measures to mitigate hardware failures, which have a severe impact on availability. By using fail-over techniques such as active-passive and active-active, it is possible to seamlessly fail-over to backup hardware. You could benefit from having an offsite backup of all data and systems.
https://www.experts-exchange.com/articles/33009/Disaster-Recovery-Solution-Design.html