Upgrade from 2.1.19 to 3.xx on N54L

I have a NAs built in 2015 that has
HP ProLiant N54L MicroServer NAS 744900-371
Kingston V300 120GB SSD SATA running OMV
4 x WD Red 3TB SATA 3.5" HD storage
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= OS/Debian information
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Distributor ID: debian
Description: Debian GNU/Linux 7 (wheezy)
Release: 7.9
Codename: wheezy
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= openmediavault information
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Release: 2.1.19
Codename: Stone burner
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= Date
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Wed Nov 29 08:19:41 AEDT 2017
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= Hostname
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OMVserver.local
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= Locale
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en_AU.UTF-8
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= System information
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Linux OMVserver 3.2.0-4-amd64 #1 SMP Debian 3.2.68-1+deb7u6 x86_64 GNU/Linux

I want to get it to feed plex on a Samsung smart TV amongst other things

Am i better to run a fresh install of Jessie then fresh install of OMV3 ?
Would it run ok or better to use it as a boat anchor and start again?

THank you. I will wipe the ssd and load jessie and a fresh install of OMV3.
I was going to physically remove the hdd's from their slots and give it a cleaq up to remove the dust.
Am i better to leave the hdd's out until i have loaded jessie and omv on the ssd then put them back in. will they be recognised in new system with data intact?

found this which says to me dont take the easy way out. copy/backup everything then make the change.

Well 1) I would make sure everything is backed up to begin with before you move. 2) You should move the hard drives over and then once RAID is turned on on the new motherboard it SHOULD hopefully see the old RAID settings and ask to Import the Forign Raid Configure Config.

If you can'd do that you may have to create a new RAID which WILL erase everything. Now just FYI if you don't have a backup of your data NEVER EVER EVER INITIALIZE a RAID! IT WILL ERASE EVERYTHING! You want to REBUILD or RECONSTUCT the RAID. Never Initialize unless you just build it.

upgrade to 3.0.86 Erasmus with ssd only in N54l
shutdown then loaded 4HDDs that were in previous version in raid 5
setup privileges etc in GUI
can access drives and all info after mounting drives in GUI
woo hoo. back on line.
now to play with PLEX